我觉得这不仅是不知恩图报的问题，就是忘恩负义，就是不道德。

I think this is not only do not know Don to repay the issue, that is ungrateful, that is immoral.

youdao

在这个自私的世界里，一个人能有的最无私的，从不抛弃他，从不知恩不报，从不背信弃义的朋友是他的狗。

Thee one absolutely unselfish friend that man can have in this selfish world, the one that never deserts him, the one that never proves ungrateful or treacherous is his dog.

youdao